What would cause my engine to have around 90 hp?

[celbii]

Hey guys have a fairly stock ka24de. Has good compression about ~175 across the board. my car has never really ran right since i got it and i just dynoed it and it is only pushing about 90 hp. anyone have any idea why it would only be pushing that much assuming the compression is good and the head gasket is not blown? Tps is good also.
Modified by celbii at 4:58 PM 3/1/2010

[sx moneypit]

What do you mean,you say your head gasket is blown?

[celbii]

What do you mean,you say your head gasket is blown?

Haha good catch, I mean its not blown.

[allenms240]

Full tune up? Dizzy rotor. Spark plugs. Spark plug cables. Fuel filter. If its still like that maybe lack of fuel? I.e. fuel pump craping out

[celbii]

Full tune up? Dizzy rotor. Spark plugs. Spark plug cables. Fuel filter. If its still like that maybe lack of fuel? I.e. fuel pump craping out

All changed, had a problem with the old fuel pump, it would sturtter around 3k and i put in a new walbro and it doesnt any more.

[allenms240]

Hmmm. Timing is good yeah?

[celbii]

Yep timing is good, even pulled the valve cover and timing marks are good also. Only thing i havent replaced are maf and and ecu, but would they account for a ~50-60 hp loss?

[sx moneypit]

Check your catalytic converter.

[Cone Junky]

Check your catalytic converter.

Sounds like a good place to start. A clogged converter can certainly effect power output. Does it have a problem revving out?

[celbii]

No cat, has full exhaust.

It revs pretty slow, it feels like it has a little power down low, put you can really notice the lack of power when you step on it and it doesnt really go anywhere, its like driving a heavy geometro :P

[Cone Junky]

Yep timing is good, even pulled the valve cover and timing marks are good also. Only thing i havent replaced are maf and and ecu, but would they account for a ~50-60 hp loss?

What's your ignition timing set at?

Other then a clogged cat or incorrect ignition timing, I think the MAF is the only other part that would make a dramatic difference in performance.

Did they check your air/fuel ratio when they did the dyno? That would certainly tell a lot.

[s13-t]

If the maf was bad wouldn't it simply make the car go into limp mode and not rev high at all...?

I would assume it has something to do with ur air/fuel ratio.

also what are your spark plugs gabbed to?

[celbii]

Whatever the FSM said, they are ngks with ngk wires, both new.

edit: Say my a/f ratios are out of whack(which i don't have any way of confirming or finding out) what would be some of the possible causes of it? The only thing on this car i havnt changed yet are really down to the maf and ecu, and once i test them if its still running s***ty im just going to look for a new motor this one is pissing me off.
Modified by celbii at 9:59 PM 3/2/2010

[s13-t]

have you had the ecu checked for codes???

a bad o2 sensor could hurt the ratio, so could poor fuel pressure. or a vacuum leak between the maf and the throttle body.

[celbii]

Hmm my 02 sensor is new and im pretty sure there is no vacuum leaks, and I don't get any codes. I suppose I could try to find another fpr and swap them out.

[Cone Junky]

If the MAF is disconnected it will switch to limp mode. But if the calibration is off, even way off, the ECU will just adapt to what the MAF tells it to do.

The a/f ratio is controlled by the MAF, the O2 sensor, and the ECT sensor.

The O2 sensor and the ECT sensor are just modifiers to fine tune what the MAF is reading.

[fiznowler]

I bought a 94 civic dx hatch it came out with 90hp! LOL I would seriously consider the MAF being the issue. If you somehow pinched or really clogged a fuel line that might limit your fuel without throwing a code.

[celbii]

I've pretty much replaced the whole fuel system minus the tank(about to buy a new oem one, cant find a used one for sale in this area) so I think the fuel system should be good now, new pump,lines, and injectors.

Im trying to get ahold of a friend to try out a different maf and ecu since that is the only thing i havnt done yet.